G.I. humor is a type of humor specific to members of the military. It is often focused on the quotidian life of a soldier and the routines of service, as well as elements of absurdity. Cop humor is a type of humor that is specific to police officers, and is similarly focused on the quotidian experiences of police work as well as its inherent absurdities. So, both types of humor are focused on everyday life in a special field and its funny elements.